How Is Bass Divided Among Speakers If No Sub?

I've heard that it can go to all five, and sometimes it is directed to the fronts. Size settings may cause this variation from Dolby, I'm guessing. IF you read different info on the net, you can see that Dolby varies on it. It may depend of your processor. The processor manual may give the best info. [http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/L.mn.0002.5.1guide.pdf] [http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/38_LFE.pdf]

Another Dolby link.[http://www.dolby.com/uploadedFiles/Assets/US/Doc/Professional/42_DDFAQ.pdf]

As mentioned it will depend on the processor you have. But when you set your processor up and select large fronts and small rears I would say most of it goes to the fronts.

Yes, your processor controls bass distribution. If you have all your speakers set to large, all get full range sound. If you have any of the centre or rears set to small, their low frequencies are sent to the mains. If you do not have bass processing on your amp/receiver, then all speakers work full range.